Table 2 HR (95% CI) for different concentrations of PM2.5 and its components (SO42-, NO3-, NH4+, OM, and BC ) and overweight/obesity after multivariable adjustment.

From: Exposure to PM2.5 and its components leads to obesity: role of socioeconomic status

 

Q1

Q2

Q3

Q4

Per IQR

P for trend

PM2.5

<35.04

35.04 ~ 36.40

36.40 ~ 39.09

>39.09

  

Case(%)/Total

2121(44.2)/4799

2197(45.7)/4806

2266(47.4)/4783

2287(47.8)/4786

  

Model 1

Ref.(1.00)

0.764(0.697,0.837)*

0.831(0.709,0.972)*

0.888(0.704,1.120)

0.938(0.867,1.016)

>0.05

Model 2

Ref.(1.00)

1.107(1.008,1.215)*

1.705(1.450,2.005)*

1.777(1.406,2.246)*

1.229(1.137,1.328)

<0.05

SO42−

<4.15

4.15 ~ 4.30

4.30 ~ 4.63

>4.63

  

Case(%)/Total

2307(45.1)/5113

2009(44.8)/4489

2261(47.2)/4787

2294(47.9)/4785

  

Model 1

Ref.(1.00)

0.834(0.760,0.915)*

1.028(0.878,1.205)

1.425(1.131,1.795)*

1.087(1.004,1.178)

<0.05

Model 2

Ref.(1.00)

1.663(1.512,1.828)*

2.477(2.104,2.915)*

3.317(2.626,4.190)*

1.512(1.401,1.633)

<0.05

NO3−

<4.54

4.54 ~ 4.82

4.82 ~ 5.20

>5.20

  

Case(%)/Total

2081(43.0)/4840

2115(44.5)/4755

2305(47.8)/4826

2370(49.9)/4753

  

Model 1

Ref.(1.00)

0.810(0.734,0.894)*

1.106(0.925,1.322)

2.458(1.917,3.151)*

1.386(1.267,1.516)

<0.05

Model 2

Ref.(1.00)

1.321(1.196,1.460)*

1.922(1.603,2.305)*

5.396(4.180,6.964)*

1.814(1.658,1.985)

<0.05

NH4+

<3.31

3.31 ~ 3.48

3.38 ~ 3.69

>3.69

  

Case(%)/Total

2154(44.1)/4889

2159(45.3)/4767

2180(45.9)/4748

2378(49.9)/4770

  

Model 1

Ref.(1.00)

0.702(0.639,0.772)*

0.869(0.734,1.028)

1.194(0.938,1.519)

1.020(0.937,1.111)

>0.05

Model 2

Ref.(1.00)

1.389(1.261,1.529)*

1.909(1.609,2.264)*

3.773(2.950,4.825)*

1.545(1.420,1.681)

<0.05

OM

<6.70

6.70 ~ 7.07

7.07 ~ 7.53

>7.53

  

Case(%)/Total

2110(43.7)/4831

2219(46.4)/4783

2319(46.2)/5021

2223(49.0)/4539

  

Model 1

Ref.(1.00)

0.719(0.665,0.789)*

1.107(0.914,1.303)

1.260(0.990,1.603)

1.025(0.943,1.114)

>0.05

Model 2

Ref.(1.00)

1.399(1.272,1.540)*

2.321(1.964,2.743)*

3.199(2.497,4.098)*

1.492(1.375,1.619)

<0.05

BC

<1.41

1.41 ~ 1.44

1.44 ~ 1.60

>1.60

  

Case(%)/Total

2673(47.4)/5637

1781(42.3)/4206

2488(47.8)/5205

1929(46.8)/4126

  

Model 1

Ref.(1.00)

1.040(0.994,1.147)

0.630(0.512,0.710)*

0.809(0.636,1.028)

0.872(0.804,0.974)

<0.05

Model 2

Ref.(1.00)

2.772(2.507,3.066)*

2.269(1.917,2.685)*

3.371(2.655,4.281)*

1.455(1.347,1.570)

<0.05

  1. The adjustment variables of the model are described in the Methods. Q1, Q2, Q3, and Q4 represent the first, second, third, and fourth quartiles of the pollutant, respectively. IQR stands for Interquartile Range. * P<0.05.
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